Bert Spaan of the Waag Society, an Institute for Art, Science, and Technology in Amsterdam, created a map of the Netherlands that visualizes all of the country’s nearly 10 million buildings by age. By using data taken from CitySDK, a toolkit co-funded by the European Union for developing application programming interfaces for cities, Spaan created an interactive, color-coded visualization of the Netherlands that lets users zero in on any of the 9,866,539 buildings in the country. The Waag Society is devoted to developing creative technology for social innovation.